Photographic film.



(3.1. COLEMAN. PHOTOGRAPHIC FILM.v

APPLICATION FxLED APR. l. |912.

PatentedAug. 2o, im

n Danna DDDUDU DDUDUDD Dnonnnnn Hannan OMDBEUU onnnnnn V fw DDDD uuunnonunnann noa-Unna nonnnnn INVENTORv 00M WITNESSES ,BY ATTORNEYSrnoroenarmc FILM.

Specification of Letters Patent.

Patented Aug. so, reis;

Application inea lapril i, 1era. serial No. 687,562.A

To all 'whom t may concern: v Be it known that I, CLYDE J. CoLEMnN, acitizen of the United States, and a resident .of New York, county of NewYork, and

State of New York, have invented certain new and useful Improvements invPhotographic Films, ,of which the following 1s a speciication.

My invention relates to improvements 1n the production of colored movingpictures, and more especially to an improved film whereby the di-iierentcolor values may be more accurately balanced or adjusted to l moreaccurately represent the colors of the real objects.

One object of my invention is to do thls with the varieus camera andprojecting apparatus now or hereafter common without requiring any orany materlal change therein. Further objects, features and advantageswill more clearly appear from the -U `detailed ydescription given belowtaken 1n connection with the accompanying drawing which forms a part ofthis specification..

The drawing illustrates a moving picture film illustrating the carryingout of my invention in one form.

By a known method of producing colored 'f moving pictures each,alternate picture sec'- tion of the lm is exposed to the red rays fromthe object, and the other picturesece tions are exposed to green, blueor greemA violet rays from the object, and upon mak;= ing a positive lmfrom such a negative, and projecting corresponding colored rays throughthe different sections by means of suitable color screens a compositecolored picture is produced. Such va -method is described in UnitedStates Letters Patent No. 941,960, to George A. Smith, grantedvNove-mber 30, 1909.

It is` found,however, that the red rays are less active on thesensitized photographic lm than other-rays, particularly the violet, sothat the red color effects are not brought out accurately enough. The-red colors may be more strongly brought out by decreasing the' valuesof green and blue, but this is at the expense of the green, blue orviolet colors.

In .order therefore, to bring-out the red more strongly I provide a filmwhich is more sensitive at those parts which are' to be exposed to redrays, while the portions which are to 'be exposed to other colored raysare less sensitive. In other words, I sensitize -the different portionsof ,to the other colors,

the film in accordance with the activity of the rays to which it is'tobe subjected.

This may be carried out in one way, as shown in the drawing in which lrepresents a sheet of sensitized film. `At RRR and RRR it is providedwith strips or bands of sensitized coatings, which are extremelysensitive, especially to red rays, while at GV, GV, GV, and GV, GV, GV,itis provided with bands of sensitized coatings which are less ornormally sensitive.

After this is done the sheet 1 may be out up into film strips of theordinary dimensions, by cutting along the lines 2, 2, sothat each lmstrip is rovided with alternate picture sections R, V, R, GV, etc., thesections R tions GV.- The strips may be perforated at 3 in any wellknown' or suitable manner. pon rapidly and consecutively exposing thefilm in av suitable camera the different sections will be substantiallyequally actedl upti by both the red and other colored rays.

n i through a suitable color screen in a suitable manner, a compositecolored. picturewith the red more accurately balanced with respect willbe produced.

Although I .have described myl improve-v ments'in great vdetail and withrespect to certain embodiments thereof, nevertheless I do not desire tobe `limited to such details except as clearly pointed out in theappended claims, since many changes and modiica tions may well'be madewithout departing from the spiritv and scope of my invention in itsbroader aspects. p

Having fully and clearly described my improvements, sire to secure byLetters'Patent, is:

l. A photographically sensitive film having portions adapted to beexposed'tol red 'rays more sensitive than portions adapted to be exposedt0 other` rays.

2. A photographically sensitive film divided in sections correspondingto dilerent tween rays of differentolors.

being more sensitive than the secif a positive be made and projectedwhat I clalrn as new and detot` l@ successive exposures,

4. A photographically sensitive film di;` vided into sections 'forsuccessive exposures,` those sections Which are adapted to be eX- posedto red rays being more sensitive than other portions to compensate forthe dierence inactivity between rays of different colors.

5. A photographica-lly sensitive ilm for colored pictures, divided intosections for the successive sections being of di'erent sensitiveness tocompensate `for the dierence in activitybetween rays of dierent colors.

In testimony whereof, l

have signed my name to this specification, in the presence of l5 twosubscribing Witnesses.

CLYDE J. CLEMAN. Witnesses:

*f GORHAM CRosmzy EDWIN Smm.

